Nicolas Vazquez created CLOUDSTACK-9539:

             Summary: Support changing Service offering for instance with VM 
                 Key: CLOUDSTACK-9539
             Project: CloudStack
          Issue Type: Bug
      Security Level: Public (Anyone can view this level - this is the default.)
            Reporter: Nicolas Vazquez
            Assignee: Nicolas Vazquez

h3. Actual behaviour
CloudStack doesn't support changing service offering for vm instances which 
have vm snapshots, they should be removed before changing service offering.

h3. Goal
Extend actual behaviour by supporting changing service offering for vms which 
have vm snapshots. In that case, previously taken snapshots (if reverted) 
should use previous service offering, future snapshots should use the newest.

h3. Proposed solution:
1) Adding {{service_offering_id}} column on {{vm_snapshots}} table: This way 
snapshot can be reverted to original state even though service offering can be 
changed for vm instance.
*NOTE:* For already created vm snapshots, {{service_offering_id}} will be null

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